隧道背后空洞影响下衬砌结构开裂特征及安全性评价

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关键词：隧道工程；衬砌空洞；衬砌开裂；安全系数；数值模型

中图分类号：U451 文献标志码：A 文章编号：1005-8249（2025）06-0048-06

DOI：10.19860/j.cnki.issn1005-8249.2025.06.009

Abstract：Cracking of lining structures under stressis acommon disease phenomenon intunnels，and the stabilityof tunel lining structures aftercracking isatopic worth discusing.Summarizethecausesand typesofcracks intheliningofahighway tunnelAnumericalmodelwasestablishedusingdiscreteelementsoftwareforasinglecavityatthetopofthelininganda combinationofcavitiesatthetopand waist.Analyzedthecrackingcharacteristicsandsafetyfactorsoflining structuresunder diferent workingconditions，andevaluatedthestabilityof tunnelliningstructures.Theresearchresults indicatethatunderthe influenceofasinglecavityatthetopofthelining，verticalcracksaregenerated，andthestructuralsafetyfactoristhelowest. Thetopisinanunstable state，whichrequiresreinforcementtreatment；Undertheinfluenceof thedoublecavityatthetopand left waist，verticalanddiagonal cracksappearatthetop，andtransversecracksappearattheleft waist.Thesafetyfactorof the topand left waistislow，andtheyareunstableandned tobereinforced immediately，especiallywhenthecavityrangeis greater than 30∘ .This achievement can provide theoretical reference for the stability assessment and reinforcement of tunnel lining structure cracking under the influence of voids.

Key words： tunnel engineering； lining cavity； lining cracking；safety factor；numerical model

0 引言

受偏压溶洞及地下水等外部因素影响，隧道围岩处于复杂多变的应力状态，其可靠性面临严峻考验。（剩余6389字）